March 2016 - IRIS v4.0 Released (current version)
Material change. Energy Conserved (OI6697) replaced Energy Conservation (OI6697). Metric name and definition language modified to increase clarity and to encompass the deprecated metric Energy Saved/Conserved (PI4009).
March 2014 - IRIS v3.0 Released
Immaterial change. Minor revision to definition language for clarity.
November 2011 - IRIS v2.2 Released
February 2011 - IRIS v2.1 Released
September 2010 - IRIS v2.0 Released
Immaterial change. IRIS ID changed due to framework upgrade. Minor revision to definition language for clarity.
September 2009 - IRIS v1.0 Released
New metric. Energy Conservation (OEN36) developed via Original IRIS Working Group.